Initialize List<> with Arrays.asList

java arrays list collections array-initialization
transient_loop picture transient_loop · May 23, 2012 · Viewed 68.8k times · Source

Why does this work:

String[] array = {"a", "b", "c"};
List<String> list = Arrays.asList(array);

but this does not:

List<String> list = Arrays.asList({"a","b","c"});

Answer

Mattias Isegran Bergander picture Mattias Isegran Bergander · May 23, 2012

This is a short hand only available when constructing and assigning an array. 

String[] array = {"a", "b", "c"};

You can do this though:

List<String> list = Arrays.asList("a","b","c");

As asList can take "vararg" arguments.

Related questions

Regarding immutable List (created by Arrays.asList())

When we create a list from an array using java.util.Arrays.asList(), the list is immutable. I am just curious to know why do we want to create a immutable list when the basic purpose of List (or Set …

Read More
Converting array to list in Java

How do I convert an array to a list in Java? I used the Arrays.asList() but the behavior (and signature) somehow changed from Java SE 1.4.2 (docs now in archive) to 8 and most snippets I found on the web use …

Read More
Convert list to array in Java

How can I convert a List to an Array in Java? Check the code below: ArrayList<Tienda> tiendas; List<Tienda> tiendasList; tiendas = new ArrayList<Tienda>(); Resources res = this.getBaseContext().getResources(); XMLParser saxparser = new XMLParser(…

Read More